Re: PEC
Ray Gralak
Hi Joe,
I have found the scale changes “somewhat”, if I go through ALL theOne possible reason for image scale changes could be "settling" of equipment after the pier flip. Also, the accuracy of the calculated image scale depends on how accurately you click the start and ends of star trails, so there can be some variation. You can try zooming in first to click an endpoint. But, you don't want to click the very last pixels of a trail. The trail has a width and so at each end you want to pick a point 1/2 the trail width from the very ends of the trail. It may account for my getting different PEC curve coefficients onI have seen this to in my 1200, but I don't think it has anything to do with image scale. It may have something to so with how the worm rides on the worm wheel on each side of the pier when there is a weight imbalance. -Ray Gralak Author of APCC (Astro-Physics Command Center): http://www.astro-physics.com/index.htm?products/accessories/software/apcc/apcc Author of PEMPro: http://www.ccdware.com Author of Astro-Physics V2 ASCOM Driver: http://www.gralak.com/apdriver Author of PulseGuide: http://www.pulseguide.com Author of Sigma: http://www.gralak.com/sigma -----Original Message-----
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Re: PEC
Ray Gralak
Hi Roland,
"but you may have to invert the PEC curve."After a pier flip, the camera will effectively be rotated 180 degrees. What was West on an image is now East, and vice versa. So, if the user ran PEMPro's Calibration Wizard on one side of the pier, and then did a pier flip, PEMPro won't know that the camera was effectively rotated 180 degrees. To compensate for the camera rotation the user can invert the PEC curve before uploading to the mount, or rerun PEMPro's Calibration Wizard. -Ray Gralak Author of APCC (Astro-Physics Command Center): http://www.astro-physics.com/index.htm?products/accessories/software/apcc/apcc Author of PEMPro: http://www.ccdware.com Author of Astro-Physics V2 ASCOM Driver: http://www.gralak.com/apdriver Author of PulseGuide: http://www.pulseguide.com Author of Sigma: http://www.gralak.com/sigma -----Original Message-----
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Re: PEC
Roland Christen
"but you may have to invert the PEC curve."
You NEVER have to invert the PEC curve. Calibration is not the same as producing a PE curve and uploading it to your mount servo. Let's not confuse the two. Once you have done a PE run and uploaded a PE curve to the mount, you should not have to do this again for a couple of years. Calibration of your camera for autoguiding is a whole other issue. There is no reason to do a PE curve willy nilly every time you set up. That is just bonkers.
Another observation: after doing a PE run, you can retrieve the curve that was loaded into your mount, and that will tell you whether or not you have done the run successfully. It will look just like the curve that you generated and uploaded.
If, after turning PE on, you still get drift in RA, then you probably are not properly polar aligned. However, even with perfect polar alignment, the RA axis will still drift due to atmospheric refraction. The only place where the exact sidereal rate produces no drift is at the zenith. Everywhere else the stars will drift slowly or rapidly depending on how far from the horizon you are pointing. The only way to eliminate RA drift (and Dec drift) is to model the sky and allow the model to modify the tracking rates.
Is it possible to determine if the RA drift is due to PE or to drift? Yes, but this requires a bit of old fashioned experimentation. Drift is constant, PE is cyclical. You can see the cyclical motion of PE by offsetting azimuth axis about 5 to 10 degrees and recording star drift with your CCD camera for about 13 minutes. You will get two worm cycles in your image, and you can then measure the amount of periodic error by looking at the cyclical trail of any star in your image. Measuring the number of pixel variation of the cycles will give you the amount of PE. If the star streaks are basically straight, then there is little or no periodic error. Do this with PEM on and PEM off to see the improvement.
Rolando
-----Original Message-----
From: 'Ray Gralak (Groups)' groups3@... [ap-gto] To: ap-gto Sent: Sat, Aug 20, 2016 10:26 am Subject: RE: [ap-gto] Re: PEC Hi Larry, I think I meant that considering nothing changes (like maybe in a permanent setup). More accurately, you will usually need to do the calibration wizard once per night. However, if you change equipment or camera orientation then you will need to calibrate again. If you do a pier flip, you don't necessarily need to calibrate, but you may have to invert the PEC curve. -Ray Gralak Author of APCC (Astro-Physics Command Center): http://www.astro-physics.com/index.htm?products/accessories/software/apcc/apcc Author of PEMPro: http://www.ccdware.com Author of Astro-Physics V2 ASCOM Driver: http://www.gralak.com/apdriver Author of PulseGuide: http://www.pulseguide.com Author of Sigma: http://www.gralak.com/sigma > -----Original Message----- > From: ap-gto@... [mailto:ap-gto@...] > Sent: Saturday, August 20, 2016 8:08 AM > To: ap-gto@... > Subject: RE: [ap-gto] Re: PEC > > > > Ray, excuse me for butting into this conversation. But the reference you made about > the Calibration Wizard says you only need to do this once. Is this also true if I > remove the telescope/camera and later replace it on the mount (a refractor) and the > camera angle is slightly off from its previous position? > > Larry > > ------------------------------------ Posted by: "Ray Gralak \(Groups\)" <groups3@...> ------------------------------------ To UNSUBSCRIBE, or for general information on the ap-gto list see http://groups.yahoo.com/group/ap-gto ------------------------------------ Yahoo Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/ap-gto/ <*> Your email settings: Individual Email | Traditional <*> To change settings online go to: http://groups.yahoo.com/group/ap-gto/join (Yahoo! ID required) <*> To change settings via email: ap-gto-digest@... ap-gto-fullfeatured@... <*> To unsubscribe from this group, send an email to: ap-gto-unsubscribe@... <*> Your use of Yahoo Groups is subject to: https://info.yahoo.com/legal/us/yahoo/utos/terms/
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Re: PEC
Joe Zeglinski
Ray,
To your point about calibration after a pier flip. I was
thinking it would be better to run calibration, but also just SKIP ahead to the
step that the user selects the “hockey stick” pattern, and changes it
“diagonally” to the previous pier side’s calibration run, selected one.
That way, the camera is not touched or adjusted, which
would change the camera angle from the original pier side calibration. I have
found the scale changes “somewhat”, if I go through ALL the calibration
steps, on the flip side. It may account for my getting different PEC
curve coefficients on alternate pier sides.
Joe
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Re: PEC
Ray Gralak
Hi Larry,
toggle quoted messageShow quoted text
I think I meant that considering nothing changes (like maybe in a permanent setup). More accurately, you will usually need to do the calibration wizard once per night. However, if you change equipment or camera orientation then you will need to calibrate again. If you do a pier flip, you don't necessarily need to calibrate, but you may have to invert the PEC curve. -Ray Gralak Author of APCC (Astro-Physics Command Center): http://www.astro-physics.com/index.htm?products/accessories/software/apcc/apcc Author of PEMPro: http://www.ccdware.com Author of Astro-Physics V2 ASCOM Driver: http://www.gralak.com/apdriver Author of PulseGuide: http://www.pulseguide.com Author of Sigma: http://www.gralak.com/sigma
-----Original Message-----
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Re: PEC
Larry Phillips
Ray, excuse me for butting into this conversation. But the reference you made about the Calibration Wizard says you only need to do this once. Is this also true if I remove the telescope/camera and later replace it on the mount (a refractor) and the camera angle is slightly off from its previous position?
Larry
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Re: PEC
Ray Gralak
Hi Vince,
toggle quoted messageShow quoted text
Thanks! I got your files. I think I see at least one problem: image scale is set to "1" (exactly), and the camera angle is "0.0000". Those are the defaults, which indicates to me that you did not run the Calibration Wizard first. That will establish camera angle and image scale, which are crucial to getting a good result. Please take a look at the Astro-Physics GTOCP3 section in the help file. This section applies to the GTOCP4 as well. An easy way to get to the help file is by pressing the F1 key when PEMPro is running. Or, you can find the same information here online: http://www.siriusimaging.com/Help/PEMProV2new/index.html?astrophysicsgtocp3.html -Ray Gralak Author of APCC (Astro-Physics Command Center): http://www.astro-physics.com/index.htm?products/accessories/software/apcc/apcc Author of PEMPro: http://www.ccdware.com Author of Astro-Physics V2 ASCOM Driver: http://www.gralak.com/apdriver Author of PulseGuide: http://www.pulseguide.com Author of Sigma: http://www.gralak.com/sigma
-----Original Message-----
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Re: PEC
Vince Salfranc
Hi Ray, Many thanks for your help. Files are on their way. Vince
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Re: PEC
Ray Gralak
Hi Vince,
toggle quoted messageShow quoted text
Can you zip all the files from your last session and email the zip file to me (groups3 AT gralak dot com), or post them in the files section? Thanks, -Ray Gralak Author of APCC (Astro-Physics Command Center): http://www.astro-physics.com/index.htm?products/accessories/software/apcc/apcc Author of PEMPro: http://www.ccdware.com Author of Astro-Physics V2 ASCOM Driver: http://www.gralak.com/apdriver Author of PulseGuide: http://www.pulseguide.com Author of Sigma: http://www.gralak.com/sigma
-----Original Message-----
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Re: PEC
Vince Salfranc
Thank you for all the advise. I seem to have done all of this and somehow there is no improvement. I am using Pempro as described here, created the curse and then send it to the mount. Then I done a new acquire data with the pem on and there is no improvement. I have also tried to reverse the curve but still no luck. Thank you for your help. Vince
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Re: AP 900GTO Mount won't connect
Jeff Kraehnke
Hi Ray,
I confirmed that APCC Virtual port is unchecked. As I was connected to the scope using the older driver, the PC froze and MaximDL 6 crashed. When I tried to reconnect afterwards, I got another error and couldn't connect to the telescope no matter what. I'm thinking this is a Windows thing. I also tried to connect using the AP Jog utility and did not succeed. Not sure what else to do so I'm using a completely different PC with a fresh and legit version of WIN7 Home Premium that has all Windows updates. I will install all ASCOM and such software and try again. I can't imagine my issue is hardware related. The other thing I was chasing prior to this connection issue was a random overcommanded DEC during autoguiding that ruined my images and if not that, oscillation. The oscillation could be controlled thru reducing aggression but I wonder if all my problems aren't related to a corrupt .NET framework. If I make any progress, I'll respond later. Thanks. Kranky
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Re: Videos for APCC v1.5
Cal,
Thanks for the tip.
Yours truly,
Jack
Jack Huerkamp Jack's Astro Accessories, LLC. 38388 Pine Streeet Pearl River, LA 70452 985-863-2165 (Home) 985-445-5063 (Mobile) mallincamusa@... www.mallincamusa.com
From: ap-gto@... [mailto:ap-gto@...]
Sent: Friday, August 19, 2016 6:06 PM To: ap-gto@... Subject: RE: [ap-gto] Videos for APCC v1.5
Jack,
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Re: Videos for APCC v1.5
Marj,
I have no problem observing other YouTube videos full screen, so it is not a browser restriction. But when I click on the YouTube link in the APCC videos I am able to see them in full screen.
Yours truly,
Jack
From: ap-gto@... [mailto:ap-gto@...]
Sent: Friday, August 19, 2016 6:17 PM To: ap-gto@... Subject: RE: [ap-gto] Videos for APCC v1.5
Hi Jack,
There are some tips at the top of our video webpage that will allow you to view full screen. I will copy them here for your convenience: Tips The video links are set up to allow full screen viewing. You may be unable to do so due to browser settings. As an alternative, click the YouTube icon in the lower right corner to take you to the YouTube website.
To increase the quality of the video, click the Settings icon to the left of the YouTube icon. And adjust the slider. The default setting is low.
Video webpage link for public beta version: http://www.astro-physics.com/tech_support/apcc/apcc-videos.htm
Clear Skies,
Marj Christen Astro-Physics, Inc 11250 Forest Hills Rd Machesney Park, IL 61115 Phone: 815-282-1513 Fax: 815-282-9847
From: ap-gto@... [mailto:ap-gto@...]
Marj,
Thanks.
Jack
Jack Huerkamp Jack's Astro Accessories, LLC. 38388 Pine Streeet Pearl River, LA 70452 985-863-2165 (Home) 985-445-5063 (Mobile)
From: ap-gto@... [mailto:ap-gto@...]
Jack, I will check into it.
Clear Skies,
Marj Christen Astro-Physics, Inc 11250 Forest Hills Rd Machesney Park, IL 61115 Phone: 815-282-1513 Fax: 815-282-9847
From: ap-gto@... [mailto:ap-gto@...]
Marj,
I was trying to view the videos on my observatory PC while setting up APCC, but Full Screen was not available. Thus the videos were small and it was almost impossible to see what was being checked andchanged. I tried several different browsers - same results.
Am I doing something wrong, or has full screen been disabled for these videos?
Jack Huerkamp Jack's Astro Accessories, LLC. 38388 Pine Streeet Pearl River, LA 70452 985-863-2165 (Home) 985-445-5063 (Mobile)
From: ap-gto@... [mailto:ap-gto@...]
Hi all,
Ray prepared a new video that deals with Setting Up Connections. Check it out at this link: http://www.astro-physics.com/tech_support/apcc/apcc-videos.htm
We’ve also included the Horizons video. Although the first portion is slightly outdated, it is still quite useful.
Clear Skies,
Marj Christen Astro-Physics, Inc 11250 Forest Hills Rd Machesney Park, IL 61115 Phone: 815-282-1513 Fax: 815-282-9847
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Re: Videos for APCC v1.5
Marj,
Thanks
Jack
From: ap-gto@... [mailto:ap-gto@...]
Sent: Friday, August 19, 2016 6:17 PM To: ap-gto@... Subject: RE: [ap-gto] Videos for APCC v1.5
Hi Jack,
There are some tips at the top of our video webpage that will allow you to view full screen. I will copy them here for your convenience: Tips The video links are set up to allow full screen viewing. You may be unable to do so due to browser settings. As an alternative, click the YouTube icon in the lower right corner to take you to the YouTube website.
To increase the quality of the video, click the Settings icon to the left of the YouTube icon. And adjust the slider. The default setting is low.
Video webpage link for public beta version: http://www.astro-physics.com/tech_support/apcc/apcc-videos.htm
Clear Skies,
Marj Christen Astro-Physics, Inc 11250 Forest Hills Rd Machesney Park, IL 61115 Phone: 815-282-1513 Fax: 815-282-9847
From: ap-gto@... [mailto:ap-gto@...]
Marj,
Thanks.
Jack
Jack Huerkamp Jack's Astro Accessories, LLC. 38388 Pine Streeet Pearl River, LA 70452 985-863-2165 (Home) 985-445-5063 (Mobile)
From: ap-gto@... [mailto:ap-gto@...]
Jack, I will check into it.
Clear Skies,
Marj Christen Astro-Physics, Inc 11250 Forest Hills Rd Machesney Park, IL 61115 Phone: 815-282-1513 Fax: 815-282-9847
From: ap-gto@... [mailto:ap-gto@...]
Marj,
I was trying to view the videos on my observatory PC while setting up APCC, but Full Screen was not available. Thus the videos were small and it was almost impossible to see what was being checked andchanged. I tried several different browsers - same results.
Am I doing something wrong, or has full screen been disabled for these videos?
Jack Huerkamp Jack's Astro Accessories, LLC. 38388 Pine Streeet Pearl River, LA 70452 985-863-2165 (Home) 985-445-5063 (Mobile)
From: ap-gto@... [mailto:ap-gto@...]
Hi all,
Ray prepared a new video that deals with Setting Up Connections. Check it out at this link: http://www.astro-physics.com/tech_support/apcc/apcc-videos.htm
We’ve also included the Horizons video. Although the first portion is slightly outdated, it is still quite useful.
Clear Skies,
Marj Christen Astro-Physics, Inc 11250 Forest Hills Rd Machesney Park, IL 61115 Phone: 815-282-1513 Fax: 815-282-9847
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Re: Videos for APCC v1.5
Hi Jack,
There are some tips at the top of our video webpage that will allow you to view full screen. I will copy them here for your convenience: Tips The video links are set up to allow full screen viewing. You may be unable to do so due to browser settings. As an alternative, click the YouTube icon in the lower right corner to take you to the YouTube website.
To increase the quality of the video, click the Settings icon to the left of the YouTube icon. And adjust the slider. The default setting is low.
Video webpage link for public beta version: http://www.astro-physics.com/tech_support/apcc/apcc-videos.htm
Clear Skies,
Marj Christen Astro-Physics, Inc 11250 Forest Hills Rd Machesney Park, IL 61115 Phone: 815-282-1513 Fax: 815-282-9847 www.astro-physics.com
From: ap-gto@... [mailto:ap-gto@...]
Sent: Friday, August 19, 2016 5:50 PM To: ap-gto@... Subject: RE: [ap-gto] Videos for APCC v1.5
Marj,
Thanks.
Jack
Jack Huerkamp Jack's Astro Accessories, LLC. 38388 Pine Streeet Pearl River, LA 70452 985-863-2165 (Home) 985-445-5063 (Mobile)
From:
ap-gto@... [mailto:ap-gto@...]
Jack, I will check into it.
Clear Skies,
Marj Christen Astro-Physics, Inc 11250 Forest Hills Rd Machesney Park, IL 61115 Phone: 815-282-1513 Fax: 815-282-9847
From:
ap-gto@... [mailto:ap-gto@...]
Marj,
I was trying to view the videos on my observatory PC while setting up APCC, but Full Screen was not available. Thus the videos were small and it was almost impossible to see what was being checked andchanged. I tried several different browsers - same results.
Am I doing something wrong, or has full screen been disabled for these videos?
Jack Huerkamp Jack's Astro Accessories, LLC. 38388 Pine Streeet Pearl River, LA 70452 985-863-2165 (Home) 985-445-5063 (Mobile)
From:
ap-gto@... [mailto:ap-gto@...]
Hi all,
Ray prepared a new video that deals with Setting Up Connections. Check it out at this link: http://www.astro-physics.com/tech_support/apcc/apcc-videos.htm
We’ve also included the Horizons video. Although the first portion is slightly outdated, it is still quite useful.
Clear Skies,
Marj Christen Astro-Physics, Inc 11250 Forest Hills Rd Machesney Park, IL 61115 Phone: 815-282-1513 Fax: 815-282-9847
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Re: Videos for APCC v1.5
Cal Sandfort
Jack,
A quick and dirty but kludgy workaround to zoom the screen in and out is to press the Ctrl key while scrolling the mouse wheel. This may help you enlarge the video until there is a proper fix. Cal
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Re: Videos for APCC v1.5
Marj,
Thanks.
Jack
Jack Huerkamp Jack's Astro Accessories, LLC. 38388 Pine Streeet Pearl River, LA 70452 985-863-2165 (Home) 985-445-5063 (Mobile) mallincamusa@... www.mallincamusa.com
From: ap-gto@... [mailto:ap-gto@...]
Sent: Friday, August 19, 2016 4:27 PM To: ap-gto@... Subject: RE: [ap-gto] Videos for APCC v1.5
Jack, I will check into it.
Clear Skies,
Marj Christen Astro-Physics, Inc 11250 Forest Hills Rd Machesney Park, IL 61115 Phone: 815-282-1513 Fax: 815-282-9847
From: ap-gto@... [mailto:ap-gto@...]
Marj,
I was trying to view the videos on my observatory PC while setting up APCC, but Full Screen was not available. Thus the videos were small and it was almost impossible to see what was being checked andchanged. I tried several different browsers - same results.
Am I doing something wrong, or has full screen been disabled for these videos?
Jack Huerkamp Jack's Astro Accessories, LLC. 38388 Pine Streeet Pearl River, LA 70452 985-863-2165 (Home) 985-445-5063 (Mobile)
From: ap-gto@... [mailto:ap-gto@...]
Hi all,
Ray prepared a new video that deals with Setting Up Connections. Check it out at this link: http://www.astro-physics.com/tech_support/apcc/apcc-videos.htm
We’ve also included the Horizons video. Although the first portion is slightly outdated, it is still quite useful.
Clear Skies,
Marj Christen Astro-Physics, Inc 11250 Forest Hills Rd Machesney Park, IL 61115 Phone: 815-282-1513 Fax: 815-282-9847
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Re: Videos for APCC v1.5
Jack, I will check into it.
Clear Skies,
Marj Christen Astro-Physics, Inc 11250 Forest Hills Rd Machesney Park, IL 61115 Phone: 815-282-1513 Fax: 815-282-9847 www.astro-physics.com
From: ap-gto@... [mailto:ap-gto@...]
Sent: Friday, August 19, 2016 3:09 PM To: ap-gto@... Subject: RE: [ap-gto] Videos for APCC v1.5
Marj,
I was trying to view the videos on my observatory PC while setting up APCC, but Full Screen was not available. Thus the videos were small and it was almost impossible to see what was being checked andchanged. I tried several different browsers - same results.
Am I doing something wrong, or has full screen been disabled for these videos?
Jack Huerkamp Jack's Astro Accessories, LLC. 38388 Pine Streeet Pearl River, LA 70452 985-863-2165 (Home) 985-445-5063 (Mobile)
From:
ap-gto@... [mailto:ap-gto@...]
Hi all,
Ray prepared a new video that deals with Setting Up Connections. Check it out at this link: http://www.astro-physics.com/tech_support/apcc/apcc-videos.htm
We’ve also included the Horizons video. Although the first portion is slightly outdated, it is still quite useful.
Clear Skies,
Marj Christen Astro-Physics, Inc 11250 Forest Hills Rd Machesney Park, IL 61115 Phone: 815-282-1513 Fax: 815-282-9847
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Re: Videos for APCC v1.5
Marj,
I was trying to view the videos on my observatory PC while setting up APCC, but Full Screen was not available. Thus the videos were small and it was almost impossible to see what was being checked andchanged. I tried several different browsers - same results.
Am I doing something wrong, or has full screen been disabled for these videos?
Jack Huerkamp Jack's Astro Accessories, LLC. 38388 Pine Streeet Pearl River, LA 70452 985-863-2165 (Home) 985-445-5063 (Mobile) mallincamusa@... www.mallincamusa.com
From: ap-gto@... [mailto:ap-gto@...]
Sent: Sunday, July 24, 2016 6:08 PM To: ap-gto@... Subject: [ap-gto] Videos for APCC v1.5
Hi all,
Ray prepared a new video that deals with Setting Up Connections. Check it out at this link: http://www.astro-physics.com/tech_support/apcc/apcc-videos.htm
We’ve also included the Horizons video. Although the first portion is slightly outdated, it is still quite useful.
Clear Skies,
Marj Christen Astro-Physics, Inc 11250 Forest Hills Rd Machesney Park, IL 61115 Phone: 815-282-1513 Fax: 815-282-9847
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Re: PEC
Here is what I do to generate a new PEMPro PEC curve for an AP mount. It is
possible that the "perfectly-correct" way is a bit different but this has worked for me: 1. Download the latest beta version of PEMPro V3 Beta. 2. Under PEC/Setup tab - "Configure Scopes/Mounts". 3. Now configure "Connect Camera". 4. Do a reasonably-good polar alignment. No need to get too fanatical or spend too much time trying to do a drift alignment or using the Polar Align Wizard. 5. When the mount and camera are configured correctly and working, run the "Wizards/Calibration Wizard" This will allow you to get the true image scale of your optical setup and camera. It is rarely exactly what the theoretical calculation says it will be so a real-world measurement is critical to getting a good, valid PEC curve. My AP 130EDF-GT refractor with flattener and SBIG STF-8300M camera has a theoretical image scale of 1.32 arcseconds per pixel. The Calibration Wizard showed that it was really 1.285. Probably the flattener was primarily responsible for that difference. At any rate that is enough difference to have created a poor PEC curve. 6. Next step is to "Acquire Data". Make sure PEC is turned off at this step. I try to pick a clear, stable night. However less-stable nights are useable if you do a lot of "worm turns" (I do about an hour's-worth per run) and let the software automatically integrate them. 7. When done with "Acquire Data", the software will step you through to "Program Mount". On very turbulent nights I might spend some time "smoothing" the data under the "AP Raw PE" tab with a scale value of 1.25 or so. Running more worm turns would probably be a better approach, but sometimes I am a bit lazy and impatient. 8. Done! Now you can run another curve with PEC turned on and see how it compares. There is a lot of advanced stuff you can do and get real mathematical but these basics have worked sufficiently for me. I hope this helps. Christopher Erickson Consulting Engineer Summit Kinetics Waikoloa, HI 96738 www.summitkinetics.com ________________________________ From: Christopher Erickson [mailto:christopher.k.erickson@gmail.com] Sent: Friday, August 19, 2016 7:17 AM To: 'ap-gto@yahoogroups.com' Subject: RE: [ap-gto] PEC Did you run the calibration wizard to find out your true image scale before acquiring data? My true image scale was a full 5% different than the mathematically-calculated value for my OTA+flattener+camera. Christopher Erickson Consulting Engineer Summit Kinetics Waikoloa, HI 96738 www.summitkinetics.com ________________________________ From: ap-gto@yahoogroups.com [mailto:ap-gto@yahoogroups.com] Sent: Friday, August 19, 2016 1:53 AM To: ap-gto@yahoogroups.com Subject: [ap-gto] PEC I am trying to program the PEM on my AP900 without any success. Could someone be kind enough to help me. 1.Do I need to point the mount to a particular part of the sky before doing the data capture to create the correction curve. 2.which option should I use to create the curve. 3.I have tried to create a curve and sent it to the mount but the guiding is no better even worse. 4. I have inverted the curve but still no improvement. 5.I can get a 5 minute exposure with no trailing when I an not autoguiding. Thank you for your help. Vince
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